MultilineRawStringIndentation false positive when using tab indentation

[TWiStErRob]

Same as #5429

The original test case from #5429's OP wasn't implemented in #5453:

        @Test
        fun `don't raise multiline raw strings if all have the correct indentation - tabs`() {
            val TAB = "\t"
            val code = """
                val a = 
                ${TAB}$TQ
                ${TAB}${TAB}Hello world!
                ${TAB}${TAB}How are you?
                ${TAB}$TQ.trimIndent()
            """.trimIndent()
            subject.compileAndLint(code)
            assertThat(subject.findings)
                .isEmpty()
        }

if all the indentation levels are tabs, it miscalculates the expected by 3:

LintMessageDetailsSplitter.kt:65:11: The indentation should be 13 but it is 10. [MultilineRawStringIndentation]
LintMessageDetailsSplitter.kt:70:10: The indentation should be 12 but it is 9. [MultilineRawStringIndentation]
SuppressionGenerator.kt:16:7: The indentation should be 9 but it is 6. [MultilineRawStringIndentation]

When the code is indented by tabs, it's expected to have the indentation inside the raw string as tab too, because this rule is enforcing code indentation inside a raw string, therefore it's not part of the output.

[t-kameyama]

Indent size should be 1.

        @Test
        fun `don't raise multiline raw strings if all have the correct indentation - tabs`() {
            val code = """
                val a = 
                ${TAB}$TQ
                ${TAB}${TAB}Hello world!
                ${TAB}${TAB}How are you?
                ${TAB}$TQ.trimIndent()
            """.trimIndent()
            val subject = MultilineRawStringIndentation(TestConfig(mapOf("indentSize" to 1)))
            subject.compileAndLint(code)
            assertThat(subject.findings)
                .isEmpty()
        }

[TWiStErRob]

Oooh, nice! Thank you, will try it.

[TWiStErRob]

Works as advertised, TWiStErRob/net.twisterrob.gradle@79ffdd6

So this is not a false positive, just a non-conventional setup.